Portable communication device including gear interlocking structure

A portable communication device comprising:

• a housing comprising a first housing, and a second housing configured to be movable relative to the first housing to be in a folded state or a non-folded state with respect to the first housing;
• a first main gear connected to the first housing and configured to be rotated in a first rotational direction, wherein the first main gear comprises first main gear teeth, and each of the first main gear teeth has a width that gradually increases in a direction perpendicular to the first rotational direction;
• a second main gear connected to the second housing and configured to be rotated in a second rotational direction opposite to the first rotational direction in interlocking with movement of the first main gear;
• a first interlocking gear provided between the first main gear and the second main gear and coupled to the first main gear to interlock movement of the first main gear with the second main gear, wherein the first interlocking gear comprises teeth, each of the teeth of the first interlocking gear has a width that gradually decreases, the teeth of the first interlocking gear are engaged with the first main gear teeth of the first main gear, and each of the teeth of the first interlocking gear comprise a first interlocking gradient area having a width that gradually decreases, and a first non-gradient area connected to the first interlocking gradient area and having a constant width;
• and
• a second interlocking gear provided between the second main gear and the first interlocking gear and coupled to the first interlocking gear to interlock movement of the first interlocking gear with the second main gear, wherein the second interlocking gear comprises teeth, and each of the teeth of the second interlocking gear has a second non-gradient area engaged with the first non-gradient area of the teeth of the first interlocking gear.

A portable communication device comprising:

• a flexible display;
• a first housing for accommodating a first portion of the flexible display;
• a second housing for accommodating a second portion of the flexible display;
• and
• a hinge structure provided substantially between the first housing and the second housing,
• wherein the hinge structure comprises:
• a first main gear connected to the first housing and configured to be rotated in a first rotational direction in response to movement of the first housing, wherein the first main gear comprises first main gear teeth, and each of the first main gear teeth has a width that varies along a rotation axis of the first main gear;
• a second main gear connected to the second housing and configured to be rotated in a second rotational direction in response to movement of the second housing, wherein the second main gear comprises second main gear teeth, and each of the second main gear teeth has a width that varies along a rotation axis of the second main gear;
• a first interlocking gear provided between the first main gear and the second main gear and coupled to the first main gear, wherein the first interlocking gear comprises teeth, and each of the teeth of the first interlocking gear has a width that varies along a rotation axis of the first interlocking gear;
• and
• a second interlocking gear provided between the first main gear and the second main gear and coupled to the second main gear, wherein the second interlocking gear comprises teeth, and each of the teeth of the second interlocking gear has a width varies along a rotation axis of the second interlocking gear.